一段功能不正常的代码

Question

//*******************************************************************************************************
//  上面的代码是已知的，我主要是实现下面的代码，主要是练习使用继承  
//
class BankAccount
{

protected double accountNumber;
protected String name;
protected double balance;
private static int accountCount = 1; // Start account numbers at 1. public BankAccount(String ownersName, double openingBalance)
{
accountNumber = accountCount++;
name=ownersName;
balance=openingBalance;
} public String getName()
{
return name;
}
public double getBalance()
{
return balance;
}

public void withdraw(double openingBalance)
{
balance-=openingBalance;
System.out.println("balance = "+balance);
}
// Deposit an amount to this account
public void deposit(double openingBalance)
{
balance+=openingBalance;
System.out.println("balance = "+balance);
}
// This method returns a String representing the state of this account.
public String toString(BankAccount record)
{
// create a string to return here.
return "User: "+record.getName()+"\nBalance: "+record.getBalance();
}
}class OverdraftAccount extends BankAccount
{
private double aLimit;

public OverdraftAccount(String ownersName, double openingBalance)
{
super(ownersName,openingBalance);
}

// Constructor with 3 parameters
public OverdraftAccount(String ownersName, double openingBalance, double aLimit)
{
super(ownersName,openingBalance);
this.aLimit=aLimit;
}

public double getALimit()
{
return aLimit;
} // Override methods here.
public void withdraw(double openingBalance)
{
double balance=super.getBalance();
System.out.println("balance = "+balance);
if(balance<aLimit)
System.out.println("You have made a over withdraw!Stop it!");
}}

Answer 1

没有哇，楼主的代码虽然有些凌乱，但思路还算清晰，
是大家没有耐心看吧！//测试数据：
/*1。Name=Stone,Opening Balance=1000
然后Add Account,点选账号，Amount=500,
然后Withdraw，则屏幕显示balance=500
Amount=501,然后Withdraw，则屏幕显示
帐户为非透支帐户，帐上金额不足。
  2。Name=Bill,Opening Balance=1000,Overdraft limit=200
然后Add Overdraft Account,点选账号，Amount=1000,
然后Withdraw，则屏幕显示balance=0
Amount=200,Withdraw，则屏幕显示-200
Amount=200,Deposit,则屏幕显示0
Amount=201，Withdraw，则提示
帐户为可透支帐户，但已经超出可透支额200元。
*//*
其它代码不用改，就改了父类BankAccount和其子类OverdraftAccount类
里的withdraw(double)方法，另外为了实现透支账号取款透支的问题，添加了一个
保护权限的方法substract(double)方法，这样既能实现功能，又起到了
保护的作用，外部调用的接口又不用改变。以下是两个修改过的类代码：*/
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
class BankAccount
{

protected double accountNumber;
protected String name;
protected double balance;
private static int accountCount = 1; // Start account numbers at 1. public BankAccount(String ownersName, double openingBalance)
{
accountNumber = accountCount++;
name=ownersName;
balance=openingBalance;
} public String getName()
{
return name;
}
public double getBalance()
{
return balance;
}


protected void subtract(double openingBalance)
{
balance-=openingBalance;
}

public void withdraw(double openingBalance)
{
//*******************************
if(openingBalance<=balance)
{
subtract(openingBalance);
System.out.println("balance = "+balance);
}
else
{
System.out.println("您的账户上没有足够的资金来取，您是非透支账户，不能透支！");
}
//*******************************
}
// Deposit an amount to this account
public void deposit(double openingBalance)
{
balance+=openingBalance;
System.out.println("balance = "+balance);
}
// This method returns a String representing the state of this account.
public String toString(BankAccount record)
{
// create a string to return here.
return "User: "+record.getName()+"\nBalance: "+record.getBalance();
}
}
class OverdraftAccount extends BankAccount
{
private double aLimit;

public OverdraftAccount(String ownersName, double openingBalance)
{
super(ownersName,openingBalance);
}

// Constructor with 3 parameters
public OverdraftAccount(String ownersName, double openingBalance, double aLimit)
{
super(ownersName,openingBalance);
this.aLimit=aLimit;
}

public double getALimit()
{
return aLimit;
} // Override methods here.
public void withdraw(double openingBalance)
{
double balance=super.getBalance();
//****************************************************
if(openingBalance>(balance+aLimit))
{
System.out.println("您拥有可透支账户，但是你要取的金额已经超出了允许的\""+aLimit+"\"元透支金额！");
}else
{
subtract(openingBalance);
System.out.println("balance = "+super.getBalance());
}
//****************************************************
}
}